Mixer



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T. G. DEMPSEY MIXER Wl T11/58858 June Q, 1923.

T. G. DEMPSEY MIXER Filed Aug. '7, 1922 ZSheVets-Sheet 2 w m m W warren stars Patented .lune 19, 1923..

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THOMAS G. DEMPSEY, 0F NEW YORK, Y.

MIXER.

Application filed August 7, 1922. Serial No. 580,199.y

To all 107mm t may concern:

Be it known that l, THoMAs Gr, Dnirrsiir, a subject oif the King of Great Britain. a resident of the city of New York, borough of the Bronx, county of New York.A and `State of New York, have invented a new and Improved Mixer, ot which the `tollowing is a full, clear, and exact description.

This. invention relates to mixers and was primarily designed for use as a concrete mixer.

A common concrete mixer is constructed with a container in which the measured ingredients are placed for mixing. Mixing` is accomplished by rotating the container or by operating the container in some manner. Such a type oi mixer does not `give a continuous flow ol Concrete. The water is added to the dry `mixture while in the container and 'it the machine has to be stopped when charged the concrete sets and a great amount of labor is needed .to remove it.

The general object of this invention is the provision of a simple and efficient mixer provide-d'with means for giving the ingredients Ito be included in a. mixture ahelical movement as they pass through a casingto mix them. y

A. further object o'f: the invention is the provision of a device for making dry mixtures which continuously delivers the mix- H ture during operation.

ilnother object of the invention is to produce a device tormixingthe dry ingredients of concrete provided with means for supplying water to the dry mixture as it leaves the casing. i

` This device is also provided with adjust-A able feeding means whereby the ingredients otthel'concrete may be fed in any desired proportions. i

These objects are accomplished by mounting on .a casing open at both ends an adjustable feeding means tor supplying the ingredients of the concrete in any desired proportions, mounting in'the casing a mixing wheel carried by a vertical shattdepending from the machine frame for giving the dry ingredients of the concrete a helical movement as they pass through the casing and introducing means tor supplying water tothe dry mixture as it leaves the casing.

These and other objects of the .invention` made up ot two sections 11 and 12.n TheY upper section 11 is cylindrical with a curved annular `enlargement at its lower end while the lower section 12 has a "curved annular enlargement on its upper end which registers with the enlargement on the upper section and walls.; `sloping inward at its lower end.` These sections are attached to one another by bolts extending through the flanges 14 and 15 integral with the sections 11 and 12 respectively. The curved portions of the two sections fitted together form an annular channel 16 about vthe casing.

A box 17 is supportedon a platform 18 and a spout 22 leading from the box extends through the platform. Carried by the box 17is an openwork frame 21 supporting the easing 10 through a band Bearings 1i) and 20 are positioned in the walls of the box and a screw conveyor 24 is mounted in these bearings. Attached to the casing 10 is the 'frame 25 carr infr bearings 26 and 27.

l LD ai A hollow shaft 30 is mounted in the bearings with Attached 'to the lower end of the shaft and positioned in alinement with 'the annular groove 16 is a mixing wheel X31. This wheel includes a disk 32 of a )diameter approximately equal to the diameter of the upper Yeasing section 11. A pluralityof cleatsl 33 made 'from angle iron are attached to the 'disk and extend along radial lines on 'its top.

Curved blades 34 arey pivotally mounted ont the `diskand extendbeyond its edge. The Vinner ends ot the blades extend throughfthe .rim 35 oit an annular plate 36. Slots 33ers on the bottom of the disk 32. These blades are' spaced around the circumference provided in the annular plate 32 and set screws 37 projecting through these slots serve to attach it to the disk 32. When the set screws are loose the annular plate 36 may be rotated through a certain angle adjusting the position of the blades 34. By tightening the set screws the blades may be set in any desired position. The disk 32 is attached to the shaft 30 by means of a threaded collar 39 bolted to the disk and engaging with a thread provided on the loiver end of the shaft.

Mounted on one end of the shaft of the screw conveyor 24 is a pulley 40 which is driven by a belt 4l While on the other end a bevel gear 42 is fixed. A shaft 43 having bevel gears 44 and 45 attached to its ends is mounted in bearings 46 and 47 carried by the frame 25. The gear 44 meshes With the gear 42 and the gear 45 meshes with a bevel gear 47 lfixed to one end of the shaft 48 mounted in bearings 49 and 50 carried by the frame 25. Attached to the other end of the shaft 48 is a bevel gear 51 which meshes with the bevel gear 52 fixed to the upper end of the shaft 30. Thus both the hollow shaft 30 and the screw conveyor are driven from the pulley 40.

A hopper 53 is carried by the casing 10. This hopper is divided into three sections 58, 59 and 60 by plates 54, 55 and 56 attached to the hopper Wall. These plates may be attached at different points thus varying the size of the sections. rlhe dry ingredients of the mixture are fed through these sections. The stones or coarse aggregate 57 are fed through the largest section 58,`the sand 6l through the next largest 59 and the cement 62 through the smallest 60.

A Water pipe 63 extends doivn through the hollow shaft 30 and has mounted on its lower end a spray 64. This spray 64 is 1ocated below the disk 32 and serves to supply Water to the mixture as it leaves the casing.

lVlien the mixer is set in operation coarse aggregate sand and cement are fed through the sections 58. 59 and 60 of the hopper respectively. These ingredients Which are to form the dry mixture rest on the mixing Wheel 31. The rotation of the Wheel 31 starts the ingredients moving about the shaft 30. At the bottom they are turning more rapidly than at the top the speed gradually decreasing from bottom to top. This motion causes each particle to travel a helical path 'through the casing or if thrown out of its rvpath b v 'another to rotate with continually increasing speed about the shaft as it descends through the casing. When the ingredients reach the bottom they are thoroughly mixed. Water is supplied to the dry mixture through the spray 64 as it leaves the casing. The blades 34 serve to prevent the mixture from sticking in the annular channel 16, of the casing l0.v After the concrete has been mixed it drops into the box 17, and is projected through the spout 22 by the conveyor 24.

The above described device lprovides a means for first mixing the dry ingredients and then supplying Water to the mixture. 1f such a mixer is stopped While full there is no danger of the concrete setting since 'the mixture in the machine is dry. Access may be had to the box 17 through the open frame 2l.

1 Would state in conclusion thatv Whilethe illustrated example constitutes a practical embodiment of my invention 1` do not limit myself strictly to the exact details herein illustrated since manifestly the same can be considerably varied Without departing from the spirit of the invention as defined in the appended claims.

lVhat I claim is:

l. A concrete mixer, comprising a casing, means for feeding the solid ingredients into the casing in the desired proportions, a hollow vertical shaft depending into the container, a mixing Wheel fixed to the lower end of the vertical shaft for giving the ingredients a helical movement to mix them, adjustable means mounted on the mixing Wheel to prevent the ingredients clogging the casing7 and means for supplying to the ingredients after they have been mixed, a spray of Water.

2. A concrete mixer of the character described, comprising a cylindrical casing having an annular channel formed ,in it near its lower end, means mounted on the upper end of the casing for feeding the solid ingredients into the casing in the desired proportions, a vertical shaft rotatably mounted in the casing. a mixing Wheel fixed to the lower end of the shaft and located in alinement with said channel. said mixing Wheel serving to give the ingredients a helical movement to mix them. adjustable means mounted on the bottom of said mixing Wheel for preventing the clogging of the solid in-d gredients in the channel, and means mounted in th e hollow shaft for supplying a spray of Water to the dry mixture as it passes from the casing. l

3. In a device of the character describedl for making concrete including` a casing, a

said casing, a circular mixing Wheel approximately the diameter of the easing 10 mounted to rotate in said annular channel so as to carry the Whole column of ingredients fed into the casing, and means for supplyng a spray of water to the mixed ngredients as they pass from the casing.

\ THOMAS G. DEMPSEY. 

